diff --git a/sc2/src/sc2code/comm/blackur/blackurc.c b/sc2/src/sc2code/comm/blackur/blackurc.c
index 5366b45de..05439d3f0 100644
--- a/sc2/src/sc2code/comm/blackur/blackurc.c
+++ b/sc2/src/sc2code/comm/blackur/blackurc.c
@@ -36,7 +36,7 @@ static LOCDATA blackurq_desc =
 	0, /* AlienSongFlags */
 	BLACKURQ_CONVERSATION_PHRASES, /* PlayerPhrases */
 	8, /* NumAnimations */
-	{
+	{ /* AlienAmbientArray (ambient animations) */
 		{
 			7, /* StartIndex */
 			6, /* NumFrames */
@@ -103,7 +103,7 @@ static LOCDATA blackurq_desc =
 			0, /* BlockMask */
 		},
 	},
-	{
+	{ /* AlienTransitionDesc */
 		1, /* StartIndex */
 		2, /* NumFrames */
 		0, /* AnimFlags */
@@ -111,7 +111,7 @@ static LOCDATA blackurq_desc =
 		0, 0, /* RestartRate */
 		0, /* BlockMask */
 	},
-	{
+	{ /* AlienTalkDesc */
 		2, /* StartIndex */
 		5, /* NumFrames */
 		0, /* AnimFlags */
diff --git a/sc2/src/sc2code/comm/yehat/yehatc.c b/sc2/src/sc2code/comm/yehat/yehatc.c
index 4818ea2ae..a381789e2 100644
--- a/sc2/src/sc2code/comm/yehat/yehatc.c
+++ b/sc2/src/sc2code/comm/yehat/yehatc.c
@@ -41,8 +41,8 @@ static LOCDATA yehat_desc =
 	0, /* AlienSongFlags */
 	YEHAT_CONVERSATION_PHRASES, /* PlayerPhrases */
 	15, /* NumAnimations */
-	{
-		{
+	{ /* AlienAmbientArray (ambient animations) */
+		{ /* right hand-wing tapping keyboard; front guy */
 			4, /* StartIndex */
 			3, /* NumFrames */
 			YOYO_ANIM
@@ -51,7 +51,7 @@ static LOCDATA yehat_desc =
 			ONE_SECOND / 4, ONE_SECOND / 2,/* RestartRate */
 			(1 << 6) | (1 << 7),
 		},
-		{
+		{ /* left hand-wing tapping keyboard; front guy */
 			7, /* StartIndex */
 			3, /* NumFrames */
 			YOYO_ANIM
@@ -92,7 +92,7 @@ static LOCDATA yehat_desc =
 			ONE_SECOND * 6, ONE_SECOND * 3,/* RestartRate */
 			(1 << 3),
 		},
-		{
+		{ /* right arm-wing rising; front guy */
 			26, /* StartIndex */
 			2, /* NumFrames */
 			YOYO_ANIM | WAIT_TALKING, /* AnimFlags */
@@ -100,7 +100,7 @@ static LOCDATA yehat_desc =
 			ONE_SECOND * 6, ONE_SECOND * 3,/* RestartRate */
 			(1 << 0) | (1 << 1),
 		},
-		{
+		{ /* left arm-wing rising; front guy */
 			28, /* StartIndex */
 			2, /* NumFrames */
 			YOYO_ANIM | WAIT_TALKING, /* AnimFlags */
@@ -165,7 +165,7 @@ static LOCDATA yehat_desc =
 			(1 << 2) | (1 << 4),
 		},
 	},
-	{
+	{ /* AlienTransitionDesc - empty */
 		0, /* StartIndex */
 		0, /* NumFrames */
 		0, /* AnimFlags */
@@ -173,7 +173,7 @@ static LOCDATA yehat_desc =
 		0, 0, /* RestartRate */
 		0, /* BlockMask */
 	},
-	{
+	{ /* AlienTalkDesc */
 		1, /* StartIndex */
 		3, /* NumFrames */
 		0, /* AnimFlags */