diff --git a/pinaxcon/proposals/forms.py b/pinaxcon/proposals/forms.py
index aa45b77f3c9e7d94cc7bb6eccb2524b8a6dbd568..466301766ce6b5cc6fadc88b59b5a0187d85ddc3 100644
--- a/pinaxcon/proposals/forms.py
+++ b/pinaxcon/proposals/forms.py
@@ -3,6 +3,7 @@ from symposion.proposals.forms import ProposalMixIn
 
 from .models import ConferenceSpeaker, TalkProposal
 
+_MARKDOWN_CHEATSHEET_URL = 'https://www.markdownguide.org/cheat-sheet'
 
 class ConferenceSpeakerForm(forms.ModelForm):
 
@@ -21,6 +22,16 @@ class ConferenceSpeakerForm(forms.ModelForm):
     def __init__(self, *a, **k):
         super(ConferenceSpeakerForm, self).__init__(*a, **k)
         self.fields['code_of_conduct'].required = True
+        for field in ('biography', 'experience'):
+            self.fields[field].help_text = self.fields[field].help_text.replace(
+                'http://warpedvisions.org/projects/markdown-cheat-sheet/',
+                _MARKDOWN_CHEATSHEET_URL,
+            ).replace(
+                # Fix a typo in Symposion model help text:
+                # <https://github.com/pinax/symposion/blob/8cb001b16946e2d98e8e45b59c2b506e51b52937/symposion/speakers/models.py#L28-L29>
+                "{}target=".format(_MARKDOWN_CHEATSHEET_URL),
+                "{}' target=".format(_MARKDOWN_CHEATSHEET_URL),
+            )
 
 
 
@@ -30,16 +41,14 @@ class ProposalForm(forms.ModelForm, ProposalMixIn):
         super(ProposalForm, self).__init__(*a, **k)
         self.description_required()
         self.abstract_required()
-        self.fields["additional_notes"].help_text = ("Anything else "
-            "you'd like the program committee to know when making their "
-            "selection. This is not made public. "
-            "Edit using "
-            "<a href='http://daringfireball.net/projects/markdown/basics' "
-            "target='_blank'>Markdown</a>.")
-        self.fields["abstract"].help_text = ("Detailed abstract. Will "
-            "be made public if your proposal is accepted. Edit "
-            "using <a href='http://daringfireball.net/projects/markdown/basics' "
-            "target='_blank'>Markdown</a>.")
+        self.fields["additional_notes"].help_text = """
+Anything else you'd like the program committee to know when making their
+selection. This is not made public. Edit using
+<a href='{}' target='_blank'>Markdown</a>.""".format(_MARKDOWN_CHEATSHEET_URL)
+        self.fields["abstract"].help_text = """
+Detailed abstract. Will be made public if your proposal is accepted.
+Edit using
+<a href='{}' target='_blank'>Markdown</a>.""".format(_MARKDOWN_CHEATSHEET_URL)
 
         for field in ("description", "abstract", "additional_notes"):
             self.fields[field].help_text += (" Please do not include "