diff --git a/src/crypto/hmac/hmac.go b/src/crypto/hmac/hmac.go
index ed3ebc06027..35b9d5a17aa 100644
--- a/src/crypto/hmac/hmac.go
+++ b/src/crypto/hmac/hmac.go
@@ -35,7 +35,7 @@ import (
 // opad = 0x5c byte repeated for key length
 // hmac = H([key ^ opad] H([key ^ ipad] text))
 
-// Marshalable is the combination of encoding.BinaryMarshaler and
+// marshalable is the combination of encoding.BinaryMarshaler and
 // encoding.BinaryUnmarshaler. Their method definitions are repeated here to
 // avoid a dependency on the encoding package.
 type marshalable interface {
diff --git a/src/runtime/mfixalloc.go b/src/runtime/mfixalloc.go
index 8788d95c003..1a249e59813 100644
--- a/src/runtime/mfixalloc.go
+++ b/src/runtime/mfixalloc.go
@@ -13,7 +13,7 @@ import (
 	"unsafe"
 )
 
-// FixAlloc is a simple free-list allocator for fixed size objects.
+// fixalloc is a simple free-list allocator for fixed size objects.
 // Malloc uses a FixAlloc wrapped around sysAlloc to manage its
 // mcache and mspan objects.
 //
diff --git a/src/runtime/mspanset.go b/src/runtime/mspanset.go
index abbd4501b14..5520d6ce75e 100644
--- a/src/runtime/mspanset.go
+++ b/src/runtime/mspanset.go
@@ -322,7 +322,7 @@ func (p *spanSetBlockAlloc) free(block *spanSetBlock) {
 	p.stack.push(&block.lfnode)
 }
 
-// haidTailIndex represents a combined 32-bit head and 32-bit tail
+// headTailIndex represents a combined 32-bit head and 32-bit tail
 // of a queue into a single 64-bit value.
 type headTailIndex uint64