diff --git a/src/TDataStd/TDataStd_ByteArray.cdl b/src/TDataStd/TDataStd_ByteArray.cdl
index da010cddae..ce03270621 100644
--- a/src/TDataStd/TDataStd_ByteArray.cdl
+++ b/src/TDataStd/TDataStd_ByteArray.cdl
@@ -39,10 +39,11 @@ is
     	 label : Label from TDF; 
     	 lower, upper : Integer from Standard; 
     	 isDelta : Boolean from Standard = Standard_False)
-    ---Purpose: Finds or creates an attribute with the array. 
-    -- If <isDelta> == False, DefaultDeltaOnModification is used.     
-    -- If attribute is already set, all input parameters are refused 
-    -- and the found attribute is returned.
+    ---Purpose: Finds or creates an attribute with the array on the specified label. 
+    -- If <isDelta> == False, DefaultDeltaOnModification is used. 
+    -- If <isDelta> == True, DeltaOnModification of the current attribute is used.
+    -- If attribute is already set, all input parameters are refused and the found
+    -- attribute is returned.
     returns ByteArray from TDataStd;
 
     
diff --git a/src/TDataStd/TDataStd_ExtStringArray.cdl b/src/TDataStd/TDataStd_ExtStringArray.cdl
index 148bd140d4..03025a0365 100644
--- a/src/TDataStd/TDataStd_ExtStringArray.cdl
+++ b/src/TDataStd/TDataStd_ExtStringArray.cdl
@@ -40,10 +40,11 @@ is
     Set (myclass; label : Label from TDF; lower, upper : Integer from Standard; 
     	    	  isDelta : Boolean from Standard = Standard_False)
     ---Purpose: Finds, or creates, an ExtStringArray attribute with <lower> 
-    --          and <upper> bounds.  The ExtStringArray  attribute is returned. 
-    --          If <isDelta> == False, DefaultDeltaOnModification is used.     
-    -- 	        If attribute is already set, all input parameters are refused 
-    --          and the found attribute is returned.
+    -- and <upper> bounds on the specified label. 
+    -- If <isDelta> == False, DefaultDeltaOnModification is used. 
+    -- If <isDelta> == True, DeltaOnModification of the current attribute is used.
+    -- If attribute is already set, all input parameters are refused and the found
+    -- attribute is returned.
     returns ExtStringArray from TDataStd;
 
     
diff --git a/src/TDataStd/TDataStd_IntegerArray.cdl b/src/TDataStd/TDataStd_IntegerArray.cdl
index 5e105e80ec..f670432f4a 100644
--- a/src/TDataStd/TDataStd_IntegerArray.cdl
+++ b/src/TDataStd/TDataStd_IntegerArray.cdl
@@ -40,7 +40,8 @@ is
     	    	  isDelta : Boolean from Standard = Standard_False)
     ---Purpose: Finds or creates on the <label> an integer array attribute 
     -- with the specified <lower> and <upper> boundaries. 
-    -- If <isDelta> == False, DefaultDeltaOnModification is used.     
+    -- If <isDelta> == False, DefaultDeltaOnModification is used. 
+    -- If <isDelta> == True, DeltaOnModification of the current attribute is used.
     -- If attribute is already set, all input parameters are refused and the found
     -- attribute is returned.
     returns IntegerArray from TDataStd;
diff --git a/src/TDataStd/TDataStd_RealArray.cdl b/src/TDataStd/TDataStd_RealArray.cdl
index 7bd718d465..2013e68d0f 100644
--- a/src/TDataStd/TDataStd_RealArray.cdl
+++ b/src/TDataStd/TDataStd_RealArray.cdl
@@ -38,10 +38,12 @@ is
 
     Set (myclass; label : Label from TDF; lower, upper : Integer from Standard; 
     	    	  isDelta : Boolean from Standard = Standard_False)
-    	---Purpose: Finds or creates on the <label> a real array attribute 
-        -- with the specified <lower> and <upper> boundaries.  
-    	-- If attribute is already set, all input parameters are refused and the found
-    	-- attribute is returned.
+    ---Purpose: Finds or creates on the <label> a real array attribute with
+    -- the specified <lower> and <upper> boundaries.  
+    -- If <isDelta> == False, DefaultDeltaOnModification is used. 
+    -- If <isDelta> == True, DeltaOnModification of the current attribute is used. 
+    -- If attribute is already set, input parameter <isDelta> is refused and the found
+    -- attribute returned.
     returns RealArray from TDataStd;