diff --git a/doc/fixes3-7-0.txt b/doc/fixes3-7-0.txt
index d569b3a69..c620671a7 100644
--- a/doc/fixes3-7-0.txt
+++ b/doc/fixes3-7-0.txt
@@ -1208,6 +1208,8 @@ wizard mode wish for terrain while on a fountain|sink spot made the counter
 	sound messages if all fountains|sinks were eventually destroyed
 add a level arrival region to the Gnone King's Wine Cellar variation of the
 	Mines' End level so that hero can't end up in the treature chamber
+make potion of water become discovered if dipping a carried container into an
+	uncursed one reports that water gets inside or slides right off
 
 
 Fixes to 3.7.0-x General Problems Exposed Via git Repository
diff --git a/include/decl.h b/include/decl.h
index 1b3d1aae3..075e8a996 100644
--- a/include/decl.h
+++ b/include/decl.h
@@ -613,6 +613,11 @@ struct instance_globals_m {
     /* region.c */
     int max_regions;
 
+    /* trap.c */
+    boolean mentioned_water; /* set to True by water_damage() if it issues
+                              * a message about water; dodip() should make
+                              * POT_WATER should become discovered */
+
     boolean havestate;
     unsigned long magic; /* validate that structure layout is preserved */
 };
diff --git a/src/decl.c b/src/decl.c
index e5a27440d..07ff63806 100644
--- a/src/decl.c
+++ b/src/decl.c
@@ -551,6 +551,8 @@ const struct instance_globals_m g_init_m = {
     UNDEFINED_VALUES, /* mapped_menu_op */
     /* region.c */
     0, /* max_regions */
+    /* trap.c */
+    FALSE, /* mentioned_water */
     TRUE, /* havestate*/
     IVMAGIC  /* m_magic to validate that structure layout has been preserved */
 };
diff --git a/src/potion.c b/src/potion.c
index 296928717..6e65c4019 100644
--- a/src/potion.c
+++ b/src/potion.c
@@ -1512,8 +1512,12 @@ H2Opotion_dip(
     } else {
         /* dipping into uncursed water; carried() check skips steed saddle */
         if (carried(targobj)) {
+            gm.mentioned_water = FALSE; /* water_damage() might set this */
             if (water_damage(targobj, 0, TRUE) != ER_NOTHING)
                 res = TRUE;
+            if (gm.mentioned_water)
+                makeknown(POT_WATER);
+            gm.mentioned_water = FALSE;
         }
     }
     if (func) {
diff --git a/src/trap.c b/src/trap.c
index ec5175222..6d671dd36 100644
--- a/src/trap.c
+++ b/src/trap.c
@@ -4208,8 +4208,7 @@ acid_damage(struct obj* obj)
 
 /* Get an object wet and damage it appropriately.
  *   "obj": if null, returns ER_NOTHING
- *   "ostr", if present, is used instead of the object name in some
- *     messages.
+ *   "ostr", if present, is used instead of the object name in some messages.
  *   "force" means not to roll luck to protect some objects.
  * Returns an erosion return value (ER_*)
  */
@@ -4253,14 +4252,18 @@ water_damage(
         return ER_GREASED;
     } else if (Is_container(obj)
                && (!Waterproof_container(obj) || (obj->cursed && !rn2(3)))) {
-        if (in_invent)
+        if (in_invent) {
             pline("Some %s gets into your %s!", hliquid("water"), ostr);
+            gm.mentioned_water = !Hallucination;
+        }
         water_damage_chain(obj->cobj, FALSE);
         return ER_DAMAGED; /* contents were damaged */
     } else if (Waterproof_container(obj)) {
         if (in_invent) {
             pline_The("%s slides right off your %s.", hliquid("water"), ostr);
-            makeknown(obj->otyp);
+            gm.mentioned_water = !Hallucination;
+            makeknown(obj->otyp); /* if an oilskin sack, discover it; doesn't
+                                   * matter for chest, large box, ice box */
         }
         /* not actually damaged, but because we /didn't/ get the "water
            gets into!" message, the player now has more information and