diff --git a/phreeqc3-doc/RELEASE.TXT b/phreeqc3-doc/RELEASE.TXT
index 8887d1eb..56241b18 100644
--- a/phreeqc3-doc/RELEASE.TXT
+++ b/phreeqc3-doc/RELEASE.TXT
@@ -3,6 +3,10 @@ Version @PHREEQC_VER@: @PHREEQC_DATE@
   	--------------
 	April 10, 2021
 	--------------
+	PHREEQC: Fixed -add_constant for phases and aqueous, exchange, surface species.
+	
+	PHREEQC: Caught NULL pointer when a SURFACE was defined with a surface not 
+	defined in SURFACE_MASTER_SPECIES or SURFACE_SPECIES.
 	
 	PHREEQC: Fixed a catastrophic error under some conditions when a surface was used 
 	with a SIT database. Also enabled EDL calculation for SIT databases; the EDL is