diff --git a/sophon/core/models.py b/sophon/core/models.py
index 07f9225..15be000 100644
--- a/sophon/core/models.py
+++ b/sophon/core/models.py
@@ -13,10 +13,26 @@ class DataSource(models.Model):
     method.
     """
 
-    pandasdmx_id = models.CharField("Internal pandasdmx source id", max_length=16, primary_key=True)
-    builtin = models.BooleanField("If the source is builtin in pandasdmx")
+    pandasdmx_id = models.CharField(
+        "PandaSDMX id",
+        help_text="Internal id used by PandaSDMX to reference the source.",
+        max_length=16,
+        primary_key=True,
+    )
 
-    settings = models.JSONField("Source info to pass to pandasdmx if the source is not builtin", null=True)
+    builtin = models.BooleanField(
+        "Builtin",
+        help_text="Whether the source is builtin in PandaSDMX or not.",
+    )
+    settings = models.JSONField(
+        "Settings",
+        help_text="Info parameter to pass to pandasdmx.add_source if the source is not builtin "
+                  "(see https://pandasdmx.readthedocs.io/en/latest/api.html#pandasdmx.add_source).",
+        null=True
+    )
+
+    def __str__(self):
+        return self.pandasdmx_id
 
 
 class Project(models.Model):
@@ -24,7 +40,23 @@ class Project(models.Model):
     A research :class:`.Project` is a work which may use zero or more :class:`.DataSource`\\ s to prove or disprove an
     hypothesis.
     """
-    name = models.CharField("Project name", max_length=512)
-    description = models.CharField("Project description", max_length=8192)
 
-    sources = models.ManyToManyField(DataSource, related_name="used_in")
+    name = models.CharField(
+        "Project name",
+        help_text="The display name of the project.",
+        max_length=512,
+    )
+    description = models.CharField(
+        "Project description",
+        help_text="A brief description of the project, to be displayed inthe overview.",
+        max_length=8192,
+    )
+
+    sources = models.ManyToManyField(
+        DataSource,
+        help_text="The sources used by this project.",
+        related_name="used_in"
+    )
+
+    def __str__(self):
+        return self.name