diff --git a/noir-projects/noir-protocol-circuits/src/crates/types/src/constants.nr b/noir-projects/noir-protocol-circuits/src/crates/types/src/constants.nr
index 480b0f825e7d..ee8ddb87f397 100644
--- a/noir-projects/noir-protocol-circuits/src/crates/types/src/constants.nr
+++ b/noir-projects/noir-protocol-circuits/src/crates/types/src/constants.nr
@@ -97,6 +97,10 @@ global FUNCTION_SELECTOR_NUM_BYTES: Field = 4;
 global NUM_FIELDS_PER_SHA256: Field = 2;
 global ARGS_HASH_CHUNK_LENGTH: u32 = 32;
 global ARGS_HASH_CHUNK_COUNT: u32 = 32;
+// The following is used in immutable state variables to compute an initialization slot whose value is used to
+// determine whether a given variable has been initialized (by asserting that the value in the slot is 0).
+// The initialization slot is computed by adding the constant bellow to the variable's storage slot. This constant has
+// to be large enough so that it's ensured that it doesn't collide with storage slots of other variables.
 global INITIALIZATION_SLOT_SEPARATOR: Field = 1000;
 
 // CONTRACT CLASS CONSTANTS