diff --git a/arrays-strings/replace_char.ipynb b/arrays-strings/replace_char.ipynb
index f1f95be..9add4c2 100644
--- a/arrays-strings/replace_char.ipynb
+++ b/arrays-strings/replace_char.ipynb
@@ -13,7 +13,7 @@
    "source": [
     "## Problem: Given a string, replace in-place all spaces with '%20'\n",
     "\n",
-    "* [Clarifying Questions](#Clarifying-Questions)\n",
+    "* [Constraints and Assumptions](#Constraints-and-Assumptions)\n",
     "* [Test Cases](#Test-Cases)\n",
     "* [Algorithm](#Algorithm)\n",
     "* [Code](#Code)\n",
@@ -25,9 +25,9 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Clarifying Questions\n",
+    "## Constraints and Assumptions\n",
     "\n",
-    "*Problem statements are sometimes intentionally ambiguous.  Asking clarifying questions, identifying constraints, and stating assumptions help to ensure you code the intended solution.*\n",
+    "*Problem statements are often intentionally ambiguous.  Identifying constraints and stating assumptions can help to ensure you code the intended solution.*\n",
     "\n",
     "* Can I assume the string is ASCII?\n",
     "    * Yes\n",