diff --git a/src/pe.rs b/src/pe.rs
index 10710277..c89b86ca 100644
--- a/src/pe.rs
+++ b/src/pe.rs
@@ -1277,6 +1277,8 @@ pub const IMAGE_REL_ARM_GPREL12: u16 = 0x0006;
 pub const IMAGE_REL_ARM_GPREL7: u16 = 0x0007;
 pub const IMAGE_REL_ARM_BLX24: u16 = 0x0008;
 pub const IMAGE_REL_ARM_BLX11: u16 = 0x0009;
+/// 32-bit relative address from byte following reloc
+pub const IMAGE_REL_ARM_REL32: u16 = 0x000A;
 /// Section table index
 pub const IMAGE_REL_ARM_SECTION: u16 = 0x000E;
 /// Offset within section
@@ -1348,6 +1350,10 @@ pub const IMAGE_REL_ARM64_SECTION: u16 = 0x000D;
 pub const IMAGE_REL_ARM64_ADDR64: u16 = 0x000E;
 /// 19 bit offset << 2 & sign ext. for conditional B
 pub const IMAGE_REL_ARM64_BRANCH19: u16 = 0x000F;
+/// TBZ/TBNZ
+pub const IMAGE_REL_ARM64_BRANCH14: u16 = 0x0010;
+/// 32-bit relative address from byte following reloc
+pub const IMAGE_REL_ARM64_REL32: u16 = 0x0011;
 
 //
 // x64 relocations
diff --git a/src/read/coff/relocation.rs b/src/read/coff/relocation.rs
index e921ed58..9a1fcb61 100644
--- a/src/read/coff/relocation.rs
+++ b/src/read/coff/relocation.rs
@@ -23,13 +23,19 @@ impl<'data, 'file, R: ReadRef<'data>> Iterator for CoffRelocationIterator<'data,
             let (kind, size, addend) = match self.file.header.machine.get(LE) {
                 pe::IMAGE_FILE_MACHINE_ARMNT => match relocation.typ.get(LE) {
                     pe::IMAGE_REL_ARM_ADDR32 => (RelocationKind::Absolute, 32, 0),
+                    pe::IMAGE_REL_ARM_ADDR32NB => (RelocationKind::ImageOffset, 32, 0),
+                    pe::IMAGE_REL_ARM_REL32 => (RelocationKind::Relative, 32, -4),
+                    pe::IMAGE_REL_ARM_SECTION => (RelocationKind::SectionIndex, 16, 0),
                     pe::IMAGE_REL_ARM_SECREL => (RelocationKind::SectionOffset, 32, 0),
                     typ => (RelocationKind::Coff(typ), 0, 0),
                 },
                 pe::IMAGE_FILE_MACHINE_ARM64 => match relocation.typ.get(LE) {
                     pe::IMAGE_REL_ARM64_ADDR32 => (RelocationKind::Absolute, 32, 0),
+                    pe::IMAGE_REL_ARM64_ADDR32NB => (RelocationKind::ImageOffset, 32, 0),
                     pe::IMAGE_REL_ARM64_SECREL => (RelocationKind::SectionOffset, 32, 0),
+                    pe::IMAGE_REL_ARM64_SECTION => (RelocationKind::SectionIndex, 16, 0),
                     pe::IMAGE_REL_ARM64_ADDR64 => (RelocationKind::Absolute, 64, 0),
+                    pe::IMAGE_REL_ARM64_REL32 => (RelocationKind::Relative, 32, -4),
                     typ => (RelocationKind::Coff(typ), 0, 0),
                 },
                 pe::IMAGE_FILE_MACHINE_I386 => match relocation.typ.get(LE) {
diff --git a/src/write/coff.rs b/src/write/coff.rs
index d223e8ce..6647b961 100644
--- a/src/write/coff.rs
+++ b/src/write/coff.rs
@@ -86,9 +86,10 @@ impl<'a> Object<'a> {
         }
 
         let constant = match self.architecture {
-            Architecture::I386 => match relocation.kind {
+            Architecture::I386 | Architecture::Arm | Architecture::Aarch64 => match relocation.kind
+            {
                 RelocationKind::Relative => {
-                    // IMAGE_REL_I386_REL32
+                    // IMAGE_REL_I386_REL32, IMAGE_REL_ARM_REL32, IMAGE_REL_ARM64_REL32
                     relocation.addend + 4
                 }
                 _ => relocation.addend,
@@ -523,6 +524,29 @@ impl<'a> Object<'a> {
                                 return Err(Error(format!("unimplemented relocation {:?}", reloc)));
                             }
                         },
+                        Architecture::Arm => match (reloc.kind, reloc.size, reloc.addend) {
+                            (RelocationKind::Absolute, 32, 0) => coff::IMAGE_REL_ARM_ADDR32,
+                            (RelocationKind::ImageOffset, 32, 0) => coff::IMAGE_REL_ARM_ADDR32NB,
+                            (RelocationKind::Relative, 32, -4) => coff::IMAGE_REL_ARM_REL32,
+                            (RelocationKind::SectionIndex, 16, 0) => coff::IMAGE_REL_ARM_SECTION,
+                            (RelocationKind::SectionOffset, 32, 0) => coff::IMAGE_REL_ARM_SECREL,
+                            (RelocationKind::Coff(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Aarch64 => match (reloc.kind, reloc.size, reloc.addend) {
+                            (RelocationKind::Absolute, 32, 0) => coff::IMAGE_REL_ARM64_ADDR32,
+                            (RelocationKind::ImageOffset, 32, 0) => coff::IMAGE_REL_ARM64_ADDR32NB,
+                            (RelocationKind::SectionIndex, 16, 0) => coff::IMAGE_REL_ARM64_SECTION,
+                            (RelocationKind::SectionOffset, 32, 0) => coff::IMAGE_REL_ARM64_SECREL,
+                            (RelocationKind::Absolute, 64, 0) => coff::IMAGE_REL_ARM64_ADDR64,
+                            (RelocationKind::Relative, 32, -4) => coff::IMAGE_REL_ARM64_REL32,
+                            (RelocationKind::Coff(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
                         _ => {
                             return Err(Error(format!(
                                 "unimplemented architecture {:?}",